Method of manufacture of flanged articles of paper or like material



' Juiy 17, 1934a T I 1,966,469

METHOD OF MAKUFACTURE OF FLANGED ARTICLES OF PAPER OR LIKE MATERIAL Filed July 15, 1932 Patented .luly 11, 1934 1,965,469.

UNITED ST TES PATENT OFFICE METHOD or MANUFACTURE or FLANGE!) narrows or PAPER 0a LIKE MATERIAL Elmer Zebley Taylor, Newark, N. I.

f Application July 15, 1982, Serial No. 822,806 '4 Claims. (01. es-ac) This invention relates to an improved method to be formed, and may or may not be rotatable of drawing flanged articles of paper or like main relation to the spindle by which it is carried. terial, such as boxes, caps or covers, and has for Although l do not wish to conflne myself to its object to avoid the many difllculties experiany special form of apparatus for use incarry- 6 enced in the present methods of drawing these ,ing out my invention, a suitable arrangement articles, among which difficulties may be menthereof is shown in Fig. 1 of the accompanying tionedz-(l) that the pleats or folds in a. flange drawing, Figs. 2, 3 and showing caps or covers produced by an uncontrolled drawing operation such as may be made by the improved method. must be homogeneous with the portion of the In Fig. 1 it will be seen that a spindle 1 carries 5 l0 flange which is not pleated, and this" can only the punch or forming head 2, the end of such 05 be accomplished by pressure, while if the punch spindle on which the punch is mounted being and die employed vary sufficiently. in size for slightly eccentric in relation to the main part this purpose the material cannot be drawn down thereof. The spindle 1 is continuously rotated between their operating surfaces without rupturby suitable means, such as pinion 3 meshing 5 ing the flange; (2) that the natural grain of the with gear 4 receiving its motion from a motor paper when acted on by the usual arrangement shaft 5. A ring or retaineril may be arranged of punch and die is not uniform around the to come into contact with the surface of the finished article, so that the flange will have a blank A resting on the top of die 6 before the tendency to open out more in one direction than punch beams to e e the d o p the edges 26 another; (3) in the usual method of drawing of such blank flat and prevent the material these caps or covers the material must contain from bulging egularly as i 1 being wn a certain amount of moisture, usually some form into the die, the degree of pressure of the ring of lubricant to prevent the fracture of the 9 on the blank depending on the tension of the drawn portion or flange during the operation springs 10 which. act on the upper surface of 2s and the evaporation of this moisture causes the ring 9. Notches or teeth 13 in the lower variations in the diameter of the finished prodsurface o r n 9 con e t notches o uct, this variation not being uniform either in teeth '7 in'the upper surface of die 6 to cause the article itself or in comparison with others; th blank A t be mp d r u arly in d fi t (4) absorption of moisture by the flnished article places around the edge to be flan it 1 80 has a tendency to cause the flange to open out being forced into the die. In the case of some and return to its original position; (5) the folds materials howver'the ring or retainer 9 and which are sometimes designedly made to space the notches or-teeth therein and in die 8 will the material evenly do not unite with the other not be necessary. material of the flange, but on the contrary tend Suitable means such as a crank movement 86 to produce weakened lines which defeat the obmust be provided for bringing the die and 90 Ject and affect the surface of the article, prepunch 01' forming head together d Separating venting it from making a tight fltting closure them at 'suitable intervals, and also for placing when employed for that purpose; and (6) it a blank A in position when they are separated. is often desirable that a container and its cover The operation of the punch or forming head 40 should both be of the same material, but while 2 carried by the continuously rotating eccentric the stock used may be perfectly suitable for ended spindle 1 is, as it comes into contact with the manufacture of the container it may not be the blank A, to force it into the die 6, the eccensuitable for drawing to form a flanged cover. trlc arrangement causing the punch to make These and other disadvantages are all overcontact with one side of the inner surface of 45 come by the method of drawing flanged articles the flange as it is being formed, thus rotating forming the subject matter of the present inthe punch on its spindle, and so gradually as it vention, according to which instead of employenters the die to roll out the flange in such a ing a die and a punch having only a recipromanner that there is no'tendency for it to be eating movement into and out of the idle, and fractured during the operation. The diameter proximately with the outer and inner diameters inner diameter of the flange to be formed, it

of the flange to be formed on the blank, I prowill be seen that the possibility .of the flange pose to use a die into which the material is being fractured by being forced into the die forced by an eccentrlcally mounted punch which (as so oftenhappens when the punch and die 55 is smaller than the inner diameter of the flange are made to leave only the actual. thickness of the respective' sizes of which correspond apof the punch 2 being slightly smaller than the .105

the material between their operative surfaces) is obviated, as there is room for the material being crimped to enter quite freely into the die at the point opposite to that at which the pressure of the punch is being applied.

It will also be understood that although the greatest pressure is only being applied at one point at any time, yet for every complete revolution of the spindle 1 such pressure will be applied to the entire circumference of the flange of the blank being operated upon.

It has been found in practice that by this method the pressure applied is sufficient to knit the fibres of the paper together so completely that the weakening lines always hitherto present are entirely obviated. The natural grain of the different portions of the flange becomes homogeneous, the displaced fibres being welded together in a new lay so that there is no tendency for the flange to open out or become deformed even by the absorption of moisture or by the drying out of any moisture that may have been in or may be applied to the article.

-When the sides of the punch or rolling head are parallel as shown in Fig. 1 a flanged cap or cover such as shown in Fig. 2 will be produced, with the side walls or flange B of equal thickness throughout, but if desired a cap or cover as shown in Fig. 3 may be obtained by the employment of a punch or rolling head of tapering form. In the latter case the extra material which is necessarily present at the outer end C of the flange would instead of being compressed to the same extent as would otherwise be necessary form a clinch to make the article when used as a cap or closure fit more closely onto the container for which it is intended, especially if the latter is made to conform to the shape of the closure. A cap such as is shown in Fig. 4 would be obtained by the use of a die with a tapering inner surface and a straight sided punch, thus disposing of the extra material in a similar way to that of the cap shown in Fig. 3.

An ejecting arrangement such 'as shown in Fig. 1 may be provided; consisting of a head 11 mounted on a spindle 12. When forming caps such as shown in Figs. 2 and 4 such head may be caused to operate at any time after the punch or rolling head has been retracted, but for caps such as shown in Fig; 3 it would be desirable that the ejector should follow the punch as it moves away until it has left the die, when the cap would be subsequently stripped oil? the punch by any suitable means.

When it is desired to produce flanged articles of other than circular shape; the die would of course be of the required form for the article, and the punch also of similar form but sufficiently smaller to permit it to enter freely into the die. The eccentric end of the spindle turns freely in the punch, and its eccentricity causes the latter to slide along the sides of the flange being formed on the blank and so impart the desired formation thereto. In this case instead of the rolling action obtained when a circular punch and die are employed to produce a circular article as hereinbefore described, an ironing effect is obtained which will however give substantially the same result.

What I claim is:--

1. The method of making a drawn flanged closure cap, consisting in pressing a blank into a die of less diameter than the blank and thereby forming a flange wall around the blank, maintaining the blank in contact with the bottom of the die and subjecting the said flange to pressure between the wall of the die and the inner side of a localized portion of said flange throughout the entire extent of said flange, so that each portion thereof is successively subjected to such pressure while the blank is held in contact with the bottom of the die.

2. The method of making a drawn flanged closure cap, consisting in forcing a blank of greater diameter than a die into said die, and

thereby forming a flange around the blank,

holding the blank against the bottom of the die, and while so holding the blank successively subjecting localized portions of the flange to outward radially directed pressure around the entire extent of the flange.

3. Apparatus of the class described, comprising a die, a punch of less diameter than the die, a shaft mounted for rotation and on which the punch is eccentrically mounted, the axis of rotation of said shaft being concentric with the die, and the punch and the die being arranged for relative movement toward and from each other to permit the punch to enter and leave the die, and means active to normally cause the punch to move out from the die.

4. Apparatus as claimed in claim 3, including a ring concentric with the die and normally in contact with the end surface of the wall of the die to grip the blank therebetween prior to the entry of the punch into the die to form a flange around the blank.

ELMER ZEVBLEY TAYLOR. 

